3D-Surface between 2 lines.

Hi all,

Previously with one of the Mathwork community users' (darova) suggestion we created 3D surfaces on the sphere.

Please find the script below.

Here I have 3 surfaces the one of which (green) is below the other 2 surfaces.

Now, I aim to fill the gap between the top (red) and bottom (green) surfaces by creating an additional surface (i.e. an oblique surface (a slightly tilted surface)).

To make it clearer, in the output image of the attached code one can see 2 lines between the top (red) and bottom (green) surfaces.

I aim to create a surface between those 2 lines in order to close the gap.

I've tried several ways, and also a triangulation method, however, was not successfull.

Could you please make a suggestion on this.

I appreciate the time you spend.

Regards

Answer 1

[darova]

what about this?

xf = [xl2(1) xl2(5) xl1(4) xl1(5)]; 
yf = [yl2(1) yl2(5) yl1(4) yl1(5)];

[Mammadbaghir Baghirzade]

Hi Darova,

Thank you for your reply.

I used the lines you provided, neverheless, it did show any changes.

I need to generate 4 side surfaces from the bottom green surface upto top red and blue surfaces.

[darova]

see this

n = 10;
xf1 = linspace(xl2(1), xl2(5), n);
xf2 = linspace(xl1(5), xl1(4), n);
yf1 = linspace(yl2(1), yl2(5), n);
yf2 = linspace(yl1(5), yl1(4), n);
zf11 = sqrt(49 - xf1.^2 - yf1.^2);
zf12 = sqrt(47.5 - xf1.^2 - yf1.^2);
zf21 = sqrt(47.5 - xf2.^2 - yf2.^2);
zf22 = sqrt(49 - xf2.^2 - yf2.^2);
surface([xf1;xf1;xf2;xf2],...
    [yf1;yf1;yf2;yf2],...
    [zf11;zf12;zf21;zf22],'facecolor','g')

[Mammadbaghir Baghirzade]

Thank you Darova,

I appreciate!

Kind regards

Answer 2

[Mehmed Saad]

I have a layman approach for this (The dumb method)

get co-ordinates by cursor

export them to workspace

save it in a variable

Now access all the co-ords

apos = [cursor_info.Position];
hold on,fill3(apos(1:3:end),apos(2:3:end),apos(3:3:end),'r','EdgeColor','none')

[Mammadbaghir Baghirzade]

Hi Mehmed,

Thank you for your reply.

I will check this method, actually at the same time I want to generate triangular meshes on the surface.

However, if that won't work your suggested approach will be the solution.

Regards

Mehmet